1. #1
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    Turbo-boosting

    If a system is rated @ 2.9 GHz (I would assume this to be the default number) with 3.4 GHz turbo boost, is it then possible for the 3.4 GHz number to show up as the clock speed in the dumps, and noted by the dumps to be over-clocked, even though I guess it really is not?
    Last edited by jcgriff2; 09-30-2017 at 09:17 PM.

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  2. #2
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    Re: Turbo-boosting

    I believe the answer is yes. I saw a thread somewhere abot this, where one of the analysts was wondering the same thing.

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    Re: Turbo-boosting

    I edited my post slightly.

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    Re: Turbo-boosting

    We saw it here recently: see 4th, 5th, 6th posts (click).

    BTW, it wasn't the dump to say it was overclocked (it was me):

    Code:
    ~MHz = REG_DWORD 3600
    Identifier = REG_SZ Intel64 Family 6 Model 158 Stepping 9
    ProcessorNameString = REG_SZ Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
    MSR8B = REG_QWORD 4200000000 <--- 4.2 GHz Max turbo boost speed according to intel i7-7700 specs webpage
    Code:
     Processor Version             Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
     Processor Voltage             8ch - 1.2V
     External Clock                100MHz
     Max Speed                     8300MHz
     Current Speed                 4000MHz
    
    Last edited by xilolee; 10-01-2017 at 06:49 AM.

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    Re: Turbo-boosting

    Yes turbo boost is the Intel clock speed ramp up when the cpu is not being fully utilized.

    Intel® Turbo Boost Technology 2.01 accelerates processor and graphics performance for peak loads, automatically allowing processor cores to run faster than the rated operating frequency if they’re operating below power, current, and temperature specification limits. Whether the processor enters into Intel® Turbo Boost Technology 2.0 and the amount of time the processor spends in that state depends on the workload and operating environment.
    Intel(R) Turbo Boost Technology 2.0
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    Re: Turbo-boosting

    Morning :-)

    wether it's overclocked or not is not easy to determine, may be a feature of turbo-boost.

    What i observed sometimes, the clock of the running cpu may rise above the given speed intel states.
    all other Cores go into idle and one cpu (single-threaded ) may speed up unexpectedly, the mechanism is not clear to me
    but i caught up a machine which did this but unfortunately no dump but a pic available:
    Code:
    [Processor Information (Type 4) - Length 48 - Handle 0045h]
      Socket Designation            LGA1151
      Processor Type                Central Processor
      Processor Family              cdh - Specification Reserved
      Processor Manufacturer        Intel(R) Corporation
      Processor ID                  e3060500fffbebbf
      Processor Version             Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
      Processor Voltage             8bh - 1.1V
      External Clock                100MHz
      Max Speed                     3600MHz
      Current Speed                 3700MHz
      Status                        Enabled Populated
    if it is a glitch of windbg (i'm unhappy with the current versions too) or whatever but
    the cpu-fan was going up and noisy and the clock may be real
    If even powersettings / savings play a role, i don't know and unfortunately minidumps do not have the info.
    Code:
    [CPU Information]
    ~MHz = REG_DWORD 3692
    Component Information = REG_BINARY 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
    Configuration Data = REG_FULL_RESOURCE_DESCRIPTOR ff,ff,ff,ff,ff,ff,ff,ff,0,0,0,0,0,0,0,0
    Identifier = REG_SZ Intel64 Family 6 Model 94 Stepping 3
    ProcessorNameString = REG_SZ Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
    Update Status = REG_DWORD 2
    VendorIdentifier = REG_SZ GenuineIntel
    MSR8B = REG_QWORD 8400000000
    that means, it can go up to???
    regards
    Michael
    Last edited by MichaelB; 10-01-2017 at 06:10 AM. Reason: added cpu-info
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    Re: Turbo-boosting

    You may see the current speed being the max frequency of a CPU with turbo boost looking like it's overclocked compared to the base frequency, I prefer to check the specs before judging about if it is overclocked or not.

  9. #9
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    Re: Turbo-boosting

    Quote Originally Posted by xilolee View Post
    We saw it here recently: see 4th, 5th, 6th posts (click).

    BTW, it wasn't the dump to say it was overclocked (it was me):

    Code:
    ~MHz = REG_DWORD 3600
    Identifier = REG_SZ Intel64 Family 6 Model 158 Stepping 9
    ProcessorNameString = REG_SZ Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
    MSR8B = REG_QWORD 4200000000 <--- 4.2 GHz Max turbo boost speed according to intel i7-7700 specs webpage
    Code:
     Processor Version             Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
     Processor Voltage             8ch - 1.2V
     External Clock                100MHz
     Max Speed                     8300MHz
     Current Speed                 4000MHz
    

    I'm going to have to wait and get a sample from Windbg as I don't recall seeing a "max speed" in the output.

    I just remember looking at the output from Windbg - it actually said "You may be overclocked" then gave an overclock ratio.

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    Re: Turbo-boosting

    I wrote this yesterday, but the page was down due to the server movement.......

    I've seen many, many instances of TurboBoost in memory dumps.
    I have not researched dumps where one of the CPU's cores was overclocked and the others weren't.

    TurboBoost is an Intel Technology that Intel specifies is OK to "boost" the CPU to these levels.
    As such, when talking with OP's I first see if it's an Intel i5 or i7 Desktop CPU, then I ask about them overclocking.
    In general, if they state that they didn't do anything to overclock, then I presume it's the TurboBoost program.
    If I don't see an overclock in the dumps, then I presume it's not overclocked.

    When it first came out I researched the overclocks that I saw, and found that Intel specifies the maximum that each processor can be overclocked.
    Here's the table for the i7 Desktop processor: Intel(R) Turbo Boost Technology Frequency Table for Intel(R) Core™ i7...
    Here's the table for the i5 Desktop processor: Intel(R) Turbo Boost Technology Frequency Tables for Intel(R) Core™ i5...

    Eventually, I gave up checking each one because there was too much work for this with too few significant results.
    In short, if it's a TurboBoost system and the OP says they aren't overclocking - then (IMO) there's no problem with that overclock as long as the system isn't showing other symptoms.
    This is sort of similar to how we treat video cards that come overclocked from the factory. They're OK unless they show other signs of a problem.

    There is nothing wrong with an overclocked processor, it's just that a different set of problems may arise when overclocking.
    The "factory overclocks" are, IMO, just a marketing ploy by the manufacturer's in order to sell more stuff. While they may be closer to the "bleeding edge" of technology, they wouldn't be selling them if they weren't reliable enough for them to make money from them.

    The point here is that, if there's no problem seen on a system with an overclock - then there's no reason to worry about it.
    If there are problems, then normal troubleshooting procedures can be used to isolate the problem - be it hardware or software.

    Finally, removing an overclock serves (again IMO) only one purpose - to see if the overclock is causing a problem.
    If it's not causing a problem, then it's nothing to worry about.
    In the "old" days, overclocking was a wild and unrestrained sport being played with relatively unsophisticated CPU's (and other hardware). These days CPU's (and some of the other devices) are much more able to protect themselves and shut down before damage occurs.
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